Busellato

Im new here and this is my first post. At work we only have two old Busellato Machines. One is a Jet 3 and the other says Jet 3004/ Gruppo Delmac on it. My Question is about the Jet 3004... I have a Jig that I use when I am running wooden Shutter rails. How can I keep the pins from popping up between running each part. When the pins pop up they knock my Jig off and I have to reset it between parts. The only way I have found to do this is to disconnect the air supply to the pins. I have also gone into the screen where I can click the pins down manually but they don't stay down. I am also loading my whole list of parts I want to run but that doesn't seem to help. Any Ideas????????